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immunity—
a person’s natural ability to resist diseases.
peso—
Mexican unit of currency (money).
smallpox—
a contagious disease that causes high fever and pus-filled
sores that leave deep scars.
Words to Understand
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18 / 66
immunity—
a person’s natural ability to resist diseases.
peso—
Mexican unit of currency (money).
smallpox—
a contagious disease that causes high fever and pus-filled
sores that leave deep scars.
Words to Understand